Sombra Warm Therapy Natural Pain Relieving Gel is a trusted product among chiropractors, physical therapists, and massage therapists for providing patients with fast topical pain relief. The warm therapy gel is used for chronic and ongoing pains such aches and arthritis. As the pain-relieving gel is rubbed on the injured area, you will begin to feel the stimulation in your muscles and joints as the soothing sensation alleviates discomfort.